Power-transmission device for motor-cars, &amp;c.



PATENTED JULY 31, 1906.

No. 827,117. I v

' I W. VON PITT LER.

POWER TRANSMISSION DEVIGEFOR MOTOR CARS, &0.

APPLICATION FILED DEO.'12. 1905' ,I v

2 SHEETS-SHEET 1.

1 61 o r 144 PM? Mfl'hussas I PATENTED JULY 31', 1906. W. VON PITTLER. POWER TRANSMISSION DEVICE FOR MOTOR mm, &c.

APPLICATION I'ILED DEC. 12. 1905.

2 SHEETS-SHEET 2.

l 3 Oa Ufi f 71651965 yvILn-ELM-;voNri'r'rnnm0F Be m-G RMANY..

- 'FfOWE H-FI f- RANSMI ISSION DIIE'DVIOIE FOR morph-ou s de;

To all. uihiom Be it known that I-,- WILHELM-VO1 I PITT- LERf-a. SubjectpftheKing ofPrus'sia, Gre'rman Emperor, residing at Berlin, in the Kingdom of Prussia, in the Empire of Ger many, have invented certain new and useful- Improvements'vin Power-Transmission Dehereof. e

My mven-tion' relates to poWertransmis'-' .sion devices or driving-gear for motor-cars or the'like in which is employed speed-changing gear, consisting of a conical'drum and a fric-i 1 tion-whel slidable'along its convex surface ,One'of the important features of my inven- "the driving-shaft.for example; a motorshaft-that is to say, it forms the drivin' tion is that the friction-wheel isarranged onpart of the driving gear, while the conica :-.drum is the driven part. .'In consequence,

when the motor-car goes slowly- -for example,

when, heavily laden and in going up gra-- d1ents'the powerstransmiss'ion takesv lace at the greatest diameter of theconical um,

' and consequentl the loss of efficiency is not- .so great as w'oul otherwise be thecase'.

-' tion-Wheelon its shaft inorder to vary the, speed. 1 Still another feature of my invention con-1 sists in a special arrangement by means of which at each forward" speed the reversal of the dlrectlon of -motion of'-the;car can be vice the purpose of w 'c is .to-slide the frics brought about, causingabackward motion ataslow speed. v 1 The accompanying drawings'illustratea. 4

- f ing-gear in top view and partly in longl nal section.

driving-gear embodying my nvention. I

- Figure 1 shows one form of my new. driv'- Fig. 2 is a section at thev A of Fig; 1 seen in the direction of the arrow.

a [verse section of aflbear'mg of the friction wheel shaft. Fig; 5 shows another arrange 'ment of'mydriving-ge'ar in'l rorizontal longi- Fig. 3 is a similar-section of the reversing: de-

vice in another position. Fig. 41s a trans-.

tudinal section. Fig. 6' is a verticalsection .at the line b b of Fig. 5 Fig. 7 isla tra'nss v,verse section at the linea a ofFig. 5f. Fig. 8 isla section at the line c-cof Figxfi. Fig.9 shows a',modified-detail, partly' section,

corresponding to" Fig- 5. Fig. "10,. shows a,

-. driyingtgeal' with two friction-cones."

itudiind A res nt d 5 314 66.

I "Similar numera'ls' Qf reference refer to si i j I larzparts m'gllth r :Thedri' g-gear, as shown inlFig si l to 4,.

has a shaft I placed in bearings-4 and 4' and driven direct from'the'motor-by meansof a. v

yielding that is tosay; jointed of flexible-."

shaft-5. uOn' the'shaft 1-I-isa' friction-pulley .2,"which can'be shifted longitudinally, and a I s fastened on a shaft 6,'whilch-i s mounted 'ohliquel'yto the shaft/ 1. .The shaft-fidrives, by means of thetoothed wheels?- and 8, the

-trai'isverse' shaft 13 Which .drives'f'the driving-J fixed fi'iction wheelg2l Aconical drum 3 is wheels or a difierential gear o'ntheshaft 13.

The shaft 1 driven by the motor; at a constants eed,. A variation of the s eed-fof the car is o tamed by-the shifting of t e "frietion-wheel 2 on the shaft 1, so that it isap lied atld'iflerent diameters of the. .conical- '75 rumi3. -.,The displacement ofthe frictions:

wheel 2 can' be effected anysuit'able I" ;means.' A preferred device-for; the purpose '1;

'is' shown in connection with the driv1ng-gear iii-Figs. 5 to 9' and i belies-cribed with refer ence thereto. )The car runs at a slow speed p the friction whee'l the position shown in 1.. By displacement to the} left-the spee'. I Another feature of in invention is a de-" i g a ually-increased;

. One arrangement forstoppin'g the carai' d for efi'ecting the reversal of the direction of movement is shown'inFigsYl to 4. f The odies 4 flare, or example, soljoined one bearing-bodies; A; which carry thefshaft 1, ,are formed as eccentrics.- 3 By the rotation-0f f f; from thedrum3 or against the away'that theffrietion-whelZ; is withdrawn from the 3, Fig. 3 or. .pressedagainstitFig; 2., Both'the bearing-i .withthe other. means 'of'anfaxle'fil and let 1 .ve'r mechanisml0' 1112 that when, turned by means of: a hand-lever th y have the same '1 movement; .and thus the ,motor-jshaftl is always shifted inxparallelismj It willgbeunderstood that the re resentation' of the fevers in Fi s. 2 and 3 is]' fagram'matic' merely and that or greater-elearn'ess in "these figures the beefi g-bodies :4 meme shaftfl arenot shown." fangle-lever'jl2is shown in the place of the bearing-bod ,lfan'd as the-ful-q c-ru'm of the. lever. lies in t e rotatingaxis Of the bearing-bodies e and f4, lflie lever is .the

shaftl in line withlthe greatest diameter of:

iro

the cone. A distance-rod 14 engages the bearing-body 4 on the same side and in its free end is mounted the axle of a friction-' wheel 15. Both the friction-wheels 2 and 15 are thereby in such relation to one another that the one moves against the cone 3 as the other moves off. If the friction-wheel 2 is pressed against the cone, Fig. 2, the car runs orward. On the other hand, if the friction wheel 2 is moved off and the friction-wheel 15 is pressed against it, Fig. 3, the friction-wheel 15 comes simultaneously into contact with the cone and with the friction-wheel 2 and eifects a reversal of the direction of rotation of the cone and also of the direction of travel.

Between the positions for going forward and backward there is a position corresponding to the motor running free, in which neither of the friction-wheels 2 15 touches the cone 3.

,1 driven is coaxial with the motor-shaft and can be coupled direct therewith. On the motor shaft 1, Fig. 5, is placed a friction-pulley 2, so that it can be shifted longitudinally,

, it being incontact With a conical drum 3,

which is free to rotate on a shaft 18, su ported obli uely. In line with the sha 1 is placed t e main shaft 40,- which transmits power to the driving-wheels of the vehicle. In an axial recess in the shaft 1 is placed a .bolt 38, which is normally held by means of spring 41 in the extreme right-hand position.

The bolt 38 has a pin 39 which projects out 'of the shaft through a slot, which permits movement of the bolt to the left- On the i end of the shaft 1 is fastened acouplingsleeve 45, which is provided with lugs 44. A toothed wheel 48 is free to rotate on the shaft 1 and is m engagement with a toothed Wheel v on a hollow shaft 6, which is secured to the drum 3 and receives the shaft 18. On the boss of the toothed' wheel 48 are provided lugs 49, corresponding to the lugs 44 of the coupling-sleeve 45,.but separated therefrom by a space. I Theshaft. 40 is enlarged at its end toform a box 46.' Within this box a coupling 42-is placed and connected by means of a tongue and groove, so that it rotates I with the shaft 40 in rotation, but can be shifted in'the direction of its axis. '-The coupling'42 has lugs 43, which lie in the position illustrated between the lugs 44 and 49 and by dlsplacement of the coupling 42 to .the oneor the'other side can be brought into engagement w th either thelugs 44or the lugs 49. The coupling 42 has an axial projecting stem 42, entering the axial recess in the shaft 1 and, bear ng against'the spring 41,

into one another an arranged therein. A hollow stem 42 pro- 'jects axially on the other side and enters an axial recess in the shaft 40. A spring 47 is placed in the recesses in the shaft 40 and the stem 42-, bearing against the coupling 42, and is stiff enoug to overcome the ressure of the spring 41, which acts from t ie other side. In this Way the coupling 42 is held normally in the extreme position to the right, in which position its lugs 43 are in engagementwith the lugs 49 of the toothed wheel 48, so that the shaft 40 is normally driven by the shaftl through the intervention of the wheel 2 of the drum 3 and the toothed Wheels 48 and 50.

- In the position shown in Fig. 5 the frictionwheel 2 ispushed so far to the left that it has hit the pin 39 of the bolt 38and through the intervention of the sprin 41 has pushed the coupling 42 so far to the eft that its lu s 43 are between the lugs 44 and 49. The direct coupling of the shafts 1 and 40 is effected when the friction-pulley 2 is shifted still farther to the left, so'that the lugs 43 of the coupling 42 engage the lugs 44 of the coupling 45, which rotates-withthe shaft 1. The shaft 1 then drives the shaft 40 direct. If

vthe friction-wheel 2 is again moved to the right, the coupling is automatically shifted again through the action of the spring 47, so

.that the lugs 43 and 49 en age one another.

The speed ratios between t e friction-pulley 2 and the drum 3 and between the toothed wheels 50 and 48 are such that" the speed of the shaft 40 is greatest when direct coupled with the shaft 1. It is best to prevent contact between the friction-pulley 2 and the drum 3 in the direct coupling ofthe shaft 1 and 40, since otherwise unnecessary wear and tear takes place and losses due to friction arise. To accom lish this, the friction-pulley 2 may be shi ted to theleft clear of the drum 3, or the diameter of the drum at the end may be furtherreducedor set off, as shown in Fig. 9..

At the extreme right-hand end the drum 3 is continued by a special narrow drum 3, which is so coupled with the drum 3 by means of a special intermediate reversinggear coupling that the two drums shall rotate to ether, or that they shall rotate in opposite 'rections, or that the drum 3 shall rotate while the drum, 3 is stationary. Tlius' upon the movement of the friction-pulley 2 to engage the drum 3- through the manipulation of the coupling the car shall run-backward or stand still. Each of thedrurns .3

and 3' is provided withan, internal gear 26 and 26, connection between the-two beingv effectedby means of ears 27 and 27 gearing respectivel W1th -l1he internal gear 26 and theinterna gear 26.

The gears 27 27 are free on eccentric bolts 28 and-28, respectively, by which bolts the two parts of the shaft 18, interrupted to permit the described .arrangementof the gear-coup Opposed to these are the: ugs 31 f a coupling,

29,.:which is mounted on the .shaft' 1'8w1th a tOngue-and-grbojze 'oonnection, so as to turn". "therewith and be movable longitudinally.

l T the axle 28 of the gear 27 takes place; "Con v .sequentlythe gear 27 does'not rotate, but oar- 2 O (r1es the ear 26 around with it that is to say',"the

fa rigid couplin and the'drum 3'runsat'a' like speed and in t e same direction as the drum- Y 3; or, in other words, the drums 3 and 3 z5-form, as it were, one singledrum when the positions will be generally maintained in tray elingl or driving;

then likewise held stationary, and the gears 35. r mo tion of the drum 3 1s opposedzto that of the directly-driven drum 3; The relative s eed s of the two .drums depend on-the sizes I 'o the gears 26 '26 27- 274. shown ii -the I o drawings, gears 26and26f and gears 27 and" 2 7 are of equal size, res'peotively, so that the drufmfi rotates at the sam'e'speed and in an opposite direction to the drum 3 in the case,

' of the engagement ofthe lugs 33 with lugs 34;

I ment of the car takes plaoe.

I 5 Under these conditions -a backward move- If the'coupling2-9 is. in v the'sha '18 is lneither eld' fast nor-con led with the drum 3',-' a1'1d inconsequencep the resistanceof the vehicle-wheels'throu'gh the .drum 3vandthe toothed wheel% the gear 26 I .{stands still and the gear27 runs freely on it, I I: r so thatthe-shaftil rotatesi'dly' inthe same is placed: the middle'position;. In order to I tween the" partsof the couplingri29, carrying the lugs 31 and the lugs 33,.is a

' corresponding shock when the lugs are thrown intojengagement :The-proper'yielding'pres- 'structionmay be used,

I I I 20 and 20 and may be'o erated by levers, as flying-gear .26. 27 27-26 operates as 'tation of the worm 37 on its. axisdoesnot parts are in the positions illustrated. These may be he d from-rotation, for example, by enga ement of lugs 33 with fixed lugs 34;" The olts--28 28,- carried by the shaft 18', are;

27 27f work simply 'as intermediate gearing transmitted, by means ofthe worm-wheel 22 between the'drums'3 and 3,' and direction of to the screw-shaft 23. .By braking the other I fdisk"20":the screw-shaft 23 is rotated in the opposite direction. Thus as the one or the other brake-disk isheld fast a shifting of the I ts middlelpoiition; ,no enga ement of its In S takes place'. Then directiona s theT drumI 3.4; Thus in'order'to" b ng hes to a standsti l-. h p

, I I ction-cou i-c ling' 32 0f ordinary'construetio'n to-reducet e" I II I I 'tate' the latter-from the-former.

sure between the drum 3 and the friction-pulley may be-obtained through the action of a pressure-spring 35, actin'g,between the, casing and a collar on the shaft 18 I For shifting thefriction -pulley2 on the shaft lareversing-gearin of a special Icon I n a transverse-recess of the shaft 1 is laced a'worm 37, on the axle of whi'ch a beve gear 19 is secured. The

latter eng'a es t'wobevelears '21 21, whichare carriediby the brakeisks 20 20, respectivelyfloose'onthe shaft 1. :The worm 37 engages a worm-wheel 22/ on a screw-shaft 23, which lie's' ina longitudinal groove of the shaft 1, Figs. 5 and 6, and engages .a' female thread formed in ablock 24; fixed in" the hub of the ulley 2, the block 24 in the rotation of the u ley and'shaft working like a key, Fig. J 7; rake-blocks '36 are applied to the disks shown in Fig.- 8. If the, rakeebloeks of both brake-disks are slack, both the brake-disks are carried around by the gear 19 and by friction I I I I 'sothat the pulley2 remains in its osition. T e cou 1mg 29', and w th itthe shaft 18,

If,however, for example, the brakelooks of the disk 20 are tightened, .s'uch disk 20,'and with it the gear "21, "are held from rotation; n Thenthe gear 19runs oni-the' gear 21 and 1 turns the worm 37, the',motionof which is friction-pulley in the one or other direction takes place. Two 'similardrums on opposite .sides of the'shaft 1. maybe provided instead of one single conical-drum, (see Fig-19,) so

that the ower of the frietion-pulley 2 1s ap- I liedat; two places-in the same'diametrical e, in which case the demand on the shaft is I o 1 less and the transmission of the'motion'is-bet ter assured;

;WhatgI 'claim,=an d to seoure Let- I 'ters'P'ate'nt'is 1. Apower-trans I a friction-wheel a shaft therefor uponwhich'.

it is longitudinally movable, means for shift ing'suchwheel'longitudinallv,comprisin two I J bevel-gears "mountedloos'ely: onthe saft, brake disks mounted withv said "gears respecjg 2.A1power-transmissiondevie'e compris g 1 ssion device eo-mpri sing 11 1'5 1120' -'tively, independerit brakes'therefor,'-a beveL-v I .-'ge ar m'ounted transversely withrespect to 1 the -shaftand; in engagement with the first/ 5.

- named bevel-gears, a crew-shaft supported by the, first-named shaft and j engagingl the 1- I 2 5 a conical friction-drum and a friction-wheel and shaft therefor upon which said wheel is longitudinally movable for cooperation with said drum, means for shifting such wheel longitudinally comprising two bevel-gears mounted loosely on the shaft, brake-disks mounted with said gears respectively, independent brakes therefor, a bevel-gear mounted transversely with respect to the shaft and in engagement with the first-named bevelgears, a screw-shaft supported by the firstnamed shaft and engaging the friction-wheel to shift the same longitudinally, and a wormgearing between the last-named bevel-gear and the screw-shaft to rotate the latter from the former.

3. A power-transmission device comprising a conical friction-drum, a friction-wheel to 006 erate with said drum, a shaft upon which said wheel is' mounted, means for shifting said wheel longitudinally, a second frictionwheel fixed on the shaft for cooperation with the drum at its greatest diameter, an inter mediate friction-wheel cooperating with the fixed friction-wheel and the drum and mov able bearings for said shaft and said intermediate friction-wheel whereby either the movable friction-wheel or the intermediate friction-wheel can be moved into contact with the drum to change the direction of rotation of the drum.

4. A power-transmission device comprising a conical friction-drum, a friction drivin wheel to cooperate with said drum, a shat upon which said driving-wheel is longitudinally movable, means for shifting such wheel longitudinally, movable bearings in which said shaft is mounted whereby the frictionwheel can be moved into and out of engagement with the drum, a second friction-wheel fixed on said shaft, an intermediate frictionwheel to make contact with the fixed frictionwheel and the drum, and means whereby the intermediate friction-wheel is moved into contact with the fixed friction-wheel and the drum as the movable friction-wheel is moved out of contact with the drum.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' WILHELM VON PITTLER.

Witnesses:

JOHANNES HUI, HENRY HASPER. 

